Imagine putting a tag the size of a childs fingertip on the wing of a monarch butterfly. Children do just that in the pages of Citizen Scientists: Be a Part of Scientific Discovery from Your Own Backyard, by Lorree Griffin Burns. This book, filled with photographs by Ellen Harasimowicz, is an inspiring invitation to young people to participate in citizen science, which the author calls the study of our world by the people who live in it.